Nanostructured LiNi0.5Mn1.5O4 cathode material synthesized by polymer-assisted co-precipitation method with improved rate capability

作者：Jin Yi Chun; Duh Jenq Gong^*

来源：Materials Letters, 2013, 93: 77-80.

DOI：10.1016/j.matlet.2012.11.039

• LiNi0.5Mn1.5O4
• Cathode material
• Nanostructured
• Polymer-assisted co-precipitation method
• Lithium ion battery

The polymer-assisted oxalate co-precipitation method has been developed to synthesize nanostructured LiNi0.5Mn1.5O4. In this method, polyacrylic acid (PAA) as a dispersant agent was applied in the co-precipitation process to achieve the well-dispersed and homogenous precursor route. The obtained powder possesses small particle around 50-100 nm as compared to the one synthesized by traditional co-precipitation method. Besides, the porous texture was also found in as-fabricated LiNi0.5Mn1.5O4. The X-ray diffraction reveals the well-crystallized cubic spinel structure without the presence of undesired impurities, such as NiO or LixNi1-xO, commonly found in other fabrication method. An excellent cycling stability is obtained with the capacity retention over 90% after 100 cycles in I C at room temperature. Moreover, the superior rate capability was also derived by nanostructured LiNi0.5Mn1.5O4, in which the discharge capacity in 5 and 7 C is around 110 and 1130 mAhg(-1), respectively. The greatly enhanced rate capability is attributed to the significantly shortened Li-ion diffusion pathway, associating with the nano-textured particle morphology.

• 出版日期2013-2-15
• 单位清华大学